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RegexpCache =
cache: {}
clear: (@cache = {}) ->
get: (pattern) ->
if pattern of @cache
@cache[pattern]
else
@cache[pattern] =
# We use try/catch to ensure that a broken regexp doesn't wholly cripple Vimium.
try
new RegExp("^" + pattern.replace(/\*/g, ".*") + "$")
catch
BgUtils.log "bad regexp in exclusion rule: #{pattern}"
/^$/ # Match the empty string.
# The Exclusions class manages the exclusion rule setting. An exclusion is an object with two attributes:
# pattern and passKeys. The exclusion rules are an array of such objects.
Exclusions =
# Make RegexpCache, which is required on the page popup, accessible via the Exclusions object.
RegexpCache: RegexpCache
rules: Settings.get "exclusionRules"
# Merge the matching rules for URL, or null. In the normal case, we use the configured @rules; hence, this
# is the default. However, when called from the page popup, we are testing what effect candidate new rules
# would have on the current tab. In this case, the candidate rules are provided by the caller.
getRule: (url, rules = @rules) ->
matchingRules = (rule for rule in rules when rule.pattern and 0 <= url.search RegexpCache.get rule.pattern)
# An absolute exclusion rule (one with no passKeys) takes priority.
for rule in matchingRules
return rule unless rule.passKeys
# Strip whitespace from all matching passKeys strings, and join them together.
passKeys = (rule.passKeys.split(/\s+/).join "" for rule in matchingRules).join ""
if 0 < matchingRules.length
passKeys: Utils.distinctCharacters passKeys
else
null
isEnabledForUrl: (url) ->
rule = Exclusions.getRule url
isEnabledForUrl: not rule or 0 < rule.passKeys.length
passKeys: rule?.passKeys ? ""
setRules: (rules) ->
# Callers map a rule to null to have it deleted, and rules without a pattern are useless.
@rules = rules.filter (rule) -> rule and rule.pattern
Settings.set "exclusionRules", @rules
postUpdateHook: (rules) ->
# NOTE(mrmr1993): In FF, the |rules| argument will be garbage collected when the exclusions popup is
# closed. Do NOT store it/use it asynchronously.
@rules = Settings.get "exclusionRules"
RegexpCache.clear()
# Register postUpdateHook for exclusionRules setting.
Settings.postUpdateHooks["exclusionRules"] = Exclusions.postUpdateHook.bind Exclusions
root = exports ? window
extend root, {Exclusions}
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